636131340 has 96 divisors (see below), whose sum is σ = 2131335360. Its totient is φ = 156584448.

The previous prime is 636131329. The next prime is 636131341. The reversal of 636131340 is 43131636.

636131340 is a `hidden beast` number, since 6 + 3 + 613 + 1 + 3 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (636131341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38289 + ... + 52328.

It is an arithmetic number, because the mean of its divisors is an integer number (22201410).

Almost surely, 2^636131340 is an apocalyptic number.

636131340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

636131340 is an abundant number, since it is smaller than the sum of its proper divisors (1495204020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

636131340 is a wasteful number, since it uses less digits than its factorization.

636131340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90648 (or 90640 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 636131340 is about 25221.6442762957. The cubic root of 636131340 is about 860.0339539506.

Adding to 636131340 its reverse (43131636), we get a palindrome (679262976).

The spelling of 636131340 in words is "six hundred thirty-six million, one hundred thirty-one thousand, three hundred forty".